{
  "manageEntity": {
    "action": "Save",
    "entityId": "1615718744",
    "entityType": "Track",
    "nonce": "0x54fd884311b4c7d7634e692bd6815f41ede4139439ce751e3564fc76b078fd83",
    "signature": "0xbf6091525ab8ff860f261fde08754aff416ccd683353dff559d1a81bb3521d414f88ae9566c1d23daf88bf25898d1fc88e9828e6fdcd9fa472cf7a01f2c0f96b1b",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}